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Physiology

 
Physiology Pectoroplasty

Physiology of Pectoralis

physiology-pectoralis-major

Physiology of Pectoralis Major

The function of the pectoralis major is different for its different heads.

  • The clavicular head flexes the humerus, and
  • the sternocostal head adducts the humerus.

    As a whole the action is to adduct and medially rotate the humerus. It also draws the scapula anteriorly and inferiorly.
Physiology of Pectoralis Minor

Physiology of Pectoralis Minor

Stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall, raises ribs in inspiration.

 

The Pectoral Girdle

There is a pectoral girdle above each arm, consisting of a scapula (shoulder blade) and a clavicle (collar bone). The shoulder girdle, also known as the pectoral girdle, forms a socket and support system for the upper limb

pectoral shoulder girdle

pectoral girdle muscles

Scapula Depressors

The scapula is a strong bone and protects the posterior upper chest.

Anterior view of the Scapula Depressors

3 Muscles are Superficial

Trapezius-Pectoralis Major-Latissimus Dorsi
scapula depressors anterior view

1 Muscle is Deep

Pectoralis Minor
pectoralis minor

1 Muscle is Lateral

Serratus Anterior
serratus anterior

Posterior view of the Scapula Depressors

2 Muscles

Trapezius-Latissimus Dorsi
posterior view scapula depressors